*{
	margin: 0px;
	padding: 0px;
}
#max{
	width: 1200px;
	height: 600px;
	margin: 200px auto;
}
.re{
	position: relative;
}
ul{
	list-style-type: none;
}
ul>li{
	width: 1200px;
	height: 600px;
	position: absolute;
	
	transition: 1s;
	opacity: 0;		/* 透明度 0看不到 1看到 */
}
ul>li img{
	width: 1200px;
	height: 600px;
}